1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2007-2009 Google Inc. and Amit Singh
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following disclaimer
15 * in the documentation and/or other materials provided with the
16 * distribution.
17 * * Neither the name of Google Inc. nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * Copyright (C) 2005 Csaba Henk.
34 * All rights reserved.
35 *
36 * Copyright (c) 2019 The FreeBSD Foundation
37 *
38 * Portions of this software were developed by BFF Storage Systems, LLC under
39 * sponsorship from the FreeBSD Foundation.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 *
50 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63 #include <sys/param.h>
64 #include <sys/buf.h>
65 #include <sys/module.h>
66 #include <sys/systm.h>
67 #include <sys/errno.h>
68 #include <sys/kernel.h>
69 #include <sys/capsicum.h>
70 #include <sys/conf.h>
71 #include <sys/filedesc.h>
72 #include <sys/uio.h>
73 #include <sys/malloc.h>
74 #include <sys/queue.h>
75 #include <sys/lock.h>
76 #include <sys/sx.h>
77 #include <sys/mutex.h>
78 #include <sys/proc.h>
79 #include <sys/vnode.h>
80 #include <sys/namei.h>
81 #include <sys/mount.h>
82 #include <sys/sysctl.h>
83 #include <sys/fcntl.h>
84 #define EXTERR_CATEGORY EXTERR_CAT_FUSE
85 #include <sys/exterrvar.h>
86
87 #include "fuse.h"
88 #include "fuse_node.h"
89 #include "fuse_ipc.h"
90 #include "fuse_internal.h"
91
92 #include <sys/priv.h>
93 #include <security/mac/mac_framework.h>
94
95 SDT_PROVIDER_DECLARE(fusefs);
96 /*
97 * Fuse trace probe:
98 * arg0: verbosity. Higher numbers give more verbose messages
99 * arg1: Textual message
100 */
101 SDT_PROBE_DEFINE2(fusefs, , vfsops, trace, "int", "char*");
102
103 /* This will do for privilege types for now */
104 #ifndef PRIV_VFS_FUSE_ALLOWOTHER
105 #define PRIV_VFS_FUSE_ALLOWOTHER PRIV_VFS_MOUNT_NONUSER
106 #endif
107 #ifndef PRIV_VFS_FUSE_MOUNT_NONUSER
108 #define PRIV_VFS_FUSE_MOUNT_NONUSER PRIV_VFS_MOUNT_NONUSER
109 #endif
110 #ifndef PRIV_VFS_FUSE_SYNC_UNMOUNT
111 #define PRIV_VFS_FUSE_SYNC_UNMOUNT PRIV_VFS_MOUNT_NONUSER
112 #endif
113
114 static vfs_fhtovp_t fuse_vfsop_fhtovp;
115 static vfs_mount_t fuse_vfsop_mount;
116 static vfs_unmount_t fuse_vfsop_unmount;
117 static vfs_root_t fuse_vfsop_root;
118 static vfs_statfs_t fuse_vfsop_statfs;
119 static vfs_vget_t fuse_vfsop_vget;
120
121 struct vfsops fuse_vfsops = {
122 .vfs_fhtovp = fuse_vfsop_fhtovp,
123 .vfs_mount = fuse_vfsop_mount,
124 .vfs_unmount = fuse_vfsop_unmount,
125 .vfs_root = fuse_vfsop_root,
126 .vfs_statfs = fuse_vfsop_statfs,
127 .vfs_vget = fuse_vfsop_vget,
128 };
129
130 static int fuse_enforce_dev_perms = 0;
131
132 SYSCTL_INT(_vfs_fusefs, OID_AUTO, enforce_dev_perms, CTLFLAG_RW,
133 &fuse_enforce_dev_perms, 0,
134 "enforce fuse device permissions for secondary mounts");
135
136 MALLOC_DEFINE(M_FUSEVFS, "fuse_filesystem", "buffer for fuse vfs layer");
137
138 static int
fuse_getdevice(const char * fspec,struct thread * td,struct cdev ** fdevp)139 fuse_getdevice(const char *fspec, struct thread *td, struct cdev **fdevp)
140 {
141 struct nameidata nd, *ndp = &nd;
142 struct vnode *devvp;
143 struct cdev *fdev;
144 int err;
145
146 /*
147 * Not an update, or updating the name: look up the name
148 * and verify that it refers to a sensible disk device.
149 */
150
151 NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec);
152 if ((err = namei(ndp)) != 0)
153 return err;
154 NDFREE_PNBUF(ndp);
155 devvp = ndp->ni_vp;
156
157 if (devvp->v_type != VCHR) {
158 vrele(devvp);
159 return ENXIO;
160 }
161 fdev = devvp->v_rdev;
162 dev_ref(fdev);
163
164 if (fuse_enforce_dev_perms) {
165 /*
166 * Check if mounter can open the fuse device.
167 *
168 * This has significance only if we are doing a secondary mount
169 * which doesn't involve actually opening fuse devices, but we
170 * still want to enforce the permissions of the device (in
171 * order to keep control over the circle of fuse users).
172 *
173 * (In case of primary mounts, we are either the superuser so
174 * we can do anything anyway, or we can mount only if the
175 * device is already opened by us, ie. we are permitted to open
176 * the device.)
177 */
178 #if 0
179 #ifdef MAC
180 err = mac_check_vnode_open(td->td_ucred, devvp, VREAD | VWRITE);
181 if (!err)
182 #endif
183 #endif /* 0 */
184 err = VOP_ACCESS(devvp, VREAD | VWRITE, td->td_ucred, td);
185 if (err) {
186 vrele(devvp);
187 dev_rel(fdev);
188 return err;
189 }
190 }
191 /*
192 * according to coda code, no extra lock is needed --
193 * although in sys/vnode.h this field is marked "v"
194 */
195 vrele(devvp);
196
197 if (!fdev->si_devsw ||
198 strcmp("fuse", fdev->si_devsw->d_name)) {
199 dev_rel(fdev);
200 return ENXIO;
201 }
202 *fdevp = fdev;
203
204 return 0;
205 }
206
207 #define FUSE_FLAGOPT(fnam, fval) do { \
208 vfs_flagopt(opts, #fnam, &mntopts, fval); \
209 vfs_flagopt(opts, "__" #fnam, &__mntopts, fval); \
210 } while (0)
211
212 SDT_PROBE_DEFINE1(fusefs, , vfsops, mntopts, "uint64_t");
213 SDT_PROBE_DEFINE4(fusefs, , vfsops, mount_err, "char*", "struct fuse_data*",
214 "struct mount*", "int");
215
216 static int
fuse_vfs_remount(struct mount * mp,struct thread * td,uint64_t mntopts,uint32_t max_read,int daemon_timeout)217 fuse_vfs_remount(struct mount *mp, struct thread *td, uint64_t mntopts,
218 uint32_t max_read, int daemon_timeout)
219 {
220 int err = 0;
221 struct fuse_data *data = fuse_get_mpdata(mp);
222 /* Don't allow these options to be changed */
223 const static unsigned long long cant_update_opts =
224 MNT_USER; /* Mount owner must be the user running the daemon */
225
226 FUSE_LOCK();
227
228 if ((mp->mnt_flag ^ data->mnt_flag) & cant_update_opts) {
229 err = EOPNOTSUPP;
230 SDT_PROBE4(fusefs, , vfsops, mount_err,
231 "Can't change these mount options during remount",
232 data, mp, err);
233 goto out;
234 }
235 if (((data->dataflags ^ mntopts) & FSESS_MNTOPTS_MASK) ||
236 (data->max_read != max_read) ||
237 (data->daemon_timeout != daemon_timeout)) {
238 // TODO: allow changing options where it makes sense
239 err = EOPNOTSUPP;
240 SDT_PROBE4(fusefs, , vfsops, mount_err,
241 "Can't change fuse mount options during remount",
242 data, mp, err);
243 goto out;
244 }
245
246 if (fdata_get_dead(data)) {
247 err = ENOTCONN;
248 SDT_PROBE4(fusefs, , vfsops, mount_err,
249 "device is dead during mount", data, mp, err);
250 goto out;
251 }
252
253 /* Sanity + permission checks */
254 if (!data->daemoncred)
255 panic("fuse daemon found, but identity unknown");
256 if (mntopts & FSESS_DAEMON_CAN_SPY)
257 err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER);
258 if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid)
259 /* are we allowed to do the first mount? */
260 err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER);
261
262 out:
263 FUSE_UNLOCK();
264 return err;
265 }
266
267 static int
fuse_vfsop_fhtovp(struct mount * mp,struct fid * fhp,int flags,struct vnode ** vpp)268 fuse_vfsop_fhtovp(struct mount *mp, struct fid *fhp, int flags,
269 struct vnode **vpp)
270 {
271 struct fuse_fid *ffhp = (struct fuse_fid *)fhp;
272 struct fuse_vnode_data *fvdat;
273 struct vnode *nvp;
274 int error;
275
276 if (!(fuse_get_mpdata(mp)->dataflags & FSESS_EXPORT_SUPPORT))
277 return (EXTERROR(EOPNOTSUPP, "NFS-style lookups are not supported"));
278
279 error = VFS_VGET(mp, ffhp->nid, LK_EXCLUSIVE, &nvp);
280 if (error) {
281 *vpp = NULLVP;
282 return (error);
283 }
284 fvdat = VTOFUD(nvp);
285 if (fvdat->generation != ffhp->gen ) {
286 vput(nvp);
287 *vpp = NULLVP;
288 return (ESTALE);
289 }
290 *vpp = nvp;
291 vnode_create_vobject(*vpp, VNODE_NO_SIZE, curthread);
292 return (0);
293 }
294
295 static int
fuse_vfsop_mount(struct mount * mp)296 fuse_vfsop_mount(struct mount *mp)
297 {
298 int err;
299
300 uint64_t mntopts, __mntopts;
301 uint32_t max_read;
302 int linux_errnos;
303 int daemon_timeout;
304 int fd;
305
306 struct cdev *fdev;
307 struct fuse_data *data = NULL;
308 struct thread *td;
309 struct file *fp, *fptmp;
310 char *fspec, *subtype, *fsname = NULL;
311 int fsnamelen;
312 struct vfsoptlist *opts;
313
314 subtype = NULL;
315 max_read = ~0;
316 linux_errnos = 0;
317 err = 0;
318 mntopts = 0;
319 __mntopts = 0;
320 td = curthread;
321
322 /* Get the new options passed to mount */
323 opts = mp->mnt_optnew;
324
325 if (!opts)
326 return (EXTERROR(EINVAL, "Mount options were not supplied"));
327
328 /* `fspath' contains the mount point (eg. /mnt/fuse/sshfs); REQUIRED */
329 if (!vfs_getopts(opts, "fspath", &err))
330 return (EXTERROR(err, "Mount options are missing 'fspath'"));
331
332 /*
333 * With the help of underscored options the mount program
334 * can inform us from the flags it sets by default
335 */
336 FUSE_FLAGOPT(allow_other, FSESS_DAEMON_CAN_SPY);
337 FUSE_FLAGOPT(push_symlinks_in, FSESS_PUSH_SYMLINKS_IN);
338 FUSE_FLAGOPT(default_permissions, FSESS_DEFAULT_PERMISSIONS);
339 FUSE_FLAGOPT(intr, FSESS_INTR);
340
341 (void)vfs_scanopt(opts, "max_read=", "%u", &max_read);
342 (void)vfs_scanopt(opts, "linux_errnos", "%d", &linux_errnos);
343 if (vfs_scanopt(opts, "timeout=", "%u", &daemon_timeout) == 1) {
344 if (daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT)
345 daemon_timeout = FUSE_MIN_DAEMON_TIMEOUT;
346 else if (daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT)
347 daemon_timeout = FUSE_MAX_DAEMON_TIMEOUT;
348 } else {
349 daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT;
350 }
351 subtype = vfs_getopts(opts, "subtype=", &err);
352
353 SDT_PROBE1(fusefs, , vfsops, mntopts, mntopts);
354
355 if (mp->mnt_flag & MNT_UPDATE) {
356 return fuse_vfs_remount(mp, td, mntopts, max_read,
357 daemon_timeout);
358 }
359
360 /* `from' contains the device name (eg. /dev/fuse0); REQUIRED */
361 fspec = vfs_getopts(opts, "from", &err);
362 if (!fspec)
363 return (EXTERROR(err, "Mount options are missing 'from'"));
364
365 /* `fd' contains the filedescriptor for this session; REQUIRED */
366 if (vfs_scanopt(opts, "fd", "%d", &fd) != 1)
367 return (EXTERROR(EINVAL, "Mount options contain an invalid value "
368 "for 'fd'"));
369
370 err = fuse_getdevice(fspec, td, &fdev);
371 if (err != 0)
372 return err;
373
374 err = fget(td, fd, &cap_read_rights, &fp);
375 if (err != 0) {
376 SDT_PROBE2(fusefs, , vfsops, trace, 1,
377 "invalid or not opened device");
378 goto out;
379 }
380 fptmp = td->td_fpop;
381 td->td_fpop = fp;
382 err = devfs_get_cdevpriv((void **)&data);
383 td->td_fpop = fptmp;
384 fdrop(fp, td);
385 FUSE_LOCK();
386
387 if (err != 0 || data == NULL) {
388 err = ENXIO;
389 SDT_PROBE4(fusefs, , vfsops, mount_err,
390 "invalid or not opened device", data, mp, err);
391 FUSE_UNLOCK();
392 goto out;
393 }
394 if (fdata_get_dead(data)) {
395 err = ENOTCONN;
396 SDT_PROBE4(fusefs, , vfsops, mount_err,
397 "device is dead during mount", data, mp, err);
398 FUSE_UNLOCK();
399 goto out;
400 }
401 /* Sanity + permission checks */
402 if (!data->daemoncred)
403 panic("fuse daemon found, but identity unknown");
404 if (mntopts & FSESS_DAEMON_CAN_SPY) {
405 err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER);
406 EXTERROR(err, "FUSE daemon requires privileges "
407 "due to 'allow_other' option");
408 }
409 if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid) {
410 /* are we allowed to do the first mount? */
411 err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER);
412 EXTERROR(err, "Mounting as a user that is different from the FUSE "
413 "daemon's requires privileges");
414 }
415 if (err) {
416 FUSE_UNLOCK();
417 goto out;
418 }
419 data->ref++;
420 data->mp = mp;
421 data->dataflags |= mntopts;
422 data->max_read = max_read;
423 data->daemon_timeout = daemon_timeout;
424 data->linux_errnos = linux_errnos;
425 data->mnt_flag = mp->mnt_flag & MNT_UPDATEMASK;
426 FUSE_UNLOCK();
427
428 vfs_getnewfsid(mp);
429 MNT_ILOCK(mp);
430 mp->mnt_data = data;
431 /*
432 * FUSE file systems can be either local or remote, but the kernel
433 * can't tell the difference.
434 */
435 mp->mnt_flag &= ~MNT_LOCAL;
436 mp->mnt_kern_flag |= MNTK_USES_BCACHE;
437 /*
438 * Disable nullfs cacheing because it can consume too many resources in
439 * the FUSE server.
440 */
441 mp->mnt_kern_flag |= MNTK_NULL_NOCACHE;
442 MNT_IUNLOCK(mp);
443 /* We need this here as this slot is used by getnewvnode() */
444 mp->mnt_stat.f_iosize = maxbcachebuf;
445 if (subtype) {
446 strlcat(mp->mnt_stat.f_fstypename, ".", MFSNAMELEN);
447 strlcat(mp->mnt_stat.f_fstypename, subtype, MFSNAMELEN);
448 }
449 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN);
450 vfs_getopt(opts, "fsname=", (void**)&fsname, &fsnamelen);
451 strlcpy(mp->mnt_stat.f_mntfromname,
452 fsname == NULL ? fspec : fsname, MNAMELEN);
453 mp->mnt_iosize_max = maxphys;
454
455 /* Now handshaking with daemon */
456 fuse_internal_send_init(data, td);
457
458 out:
459 if (err) {
460 FUSE_LOCK();
461 if (data != NULL && data->mp == mp) {
462 /*
463 * Destroy device only if we acquired reference to
464 * it
465 */
466 SDT_PROBE4(fusefs, , vfsops, mount_err,
467 "mount failed, destroy device", data, mp, err);
468 data->mp = NULL;
469 mp->mnt_data = NULL;
470 fdata_trydestroy(data);
471 }
472 FUSE_UNLOCK();
473 dev_rel(fdev);
474 }
475 return err;
476 }
477
478 static int
fuse_vfsop_unmount(struct mount * mp,int mntflags)479 fuse_vfsop_unmount(struct mount *mp, int mntflags)
480 {
481 int err = 0;
482 int flags = 0;
483
484 struct cdev *fdev;
485 struct fuse_data *data;
486 struct fuse_dispatcher fdi;
487 struct thread *td = curthread;
488
489 if (mntflags & MNT_FORCE) {
490 flags |= FORCECLOSE;
491 }
492 data = fuse_get_mpdata(mp);
493 if (!data) {
494 panic("no private data for mount point?");
495 }
496 /* There is 1 extra root vnode reference (mp->mnt_data). */
497 FUSE_LOCK();
498 if (data->vroot != NULL) {
499 struct vnode *vroot = data->vroot;
500
501 data->vroot = NULL;
502 FUSE_UNLOCK();
503 vrele(vroot);
504 } else
505 FUSE_UNLOCK();
506 err = vflush(mp, 0, flags, td);
507 if (err) {
508 return err;
509 }
510 if (fdata_get_dead(data)) {
511 goto alreadydead;
512 }
513 if (fsess_maybe_impl(mp, FUSE_DESTROY)) {
514 fdisp_init(&fdi, 0);
515 fdisp_make(&fdi, FUSE_DESTROY, mp, 0, td, NULL);
516
517 (void)fdisp_wait_answ(&fdi);
518 fdisp_destroy(&fdi);
519 }
520
521 fdata_set_dead(data);
522
523 alreadydead:
524 FUSE_LOCK();
525 data->mp = NULL;
526 fdev = data->fdev;
527 fdata_trydestroy(data);
528 FUSE_UNLOCK();
529
530 MNT_ILOCK(mp);
531 mp->mnt_data = NULL;
532 MNT_IUNLOCK(mp);
533
534 dev_rel(fdev);
535
536 return 0;
537 }
538
539 SDT_PROBE_DEFINE1(fusefs, , vfsops, invalidate_without_export,
540 "struct mount*");
541 static int
fuse_vfsop_vget(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)542 fuse_vfsop_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
543 {
544 struct fuse_data *data = fuse_get_mpdata(mp);
545 uint64_t nodeid = ino;
546 struct thread *td = curthread;
547 struct fuse_dispatcher fdi;
548 struct fuse_entry_out *feo;
549 struct fuse_vnode_data *fvdat;
550 struct timespec now;
551 const char dot[] = ".";
552 __enum_uint8(vtype) vtyp;
553 int error;
554
555 if (!(data->dataflags & FSESS_EXPORT_SUPPORT)) {
556 /*
557 * Unreachable unless you do something stupid, like export a
558 * nullfs mount of a fusefs file system.
559 */
560 SDT_PROBE1(fusefs, , vfsops, invalidate_without_export, mp);
561 return (EXTERROR(EOPNOTSUPP, "NFS-style lookups are not supported"));
562 }
563
564 error = fuse_internal_get_cached_vnode(mp, ino, flags, vpp);
565 if (error || *vpp != NULL)
566 return error;
567
568 getnanouptime(&now);
569
570 /* Do a LOOKUP, using nodeid as the parent and "." as filename */
571 fdisp_init(&fdi, sizeof(dot));
572 fdisp_make(&fdi, FUSE_LOOKUP, mp, nodeid, td, td->td_ucred);
573 memcpy(fdi.indata, dot, sizeof(dot));
574 error = fdisp_wait_answ(&fdi);
575
576 if (error)
577 goto out;
578
579 feo = (struct fuse_entry_out *)fdi.answ;
580
581 if (feo->nodeid == 0) {
582 /* zero nodeid means ENOENT and cache it */
583 error = ENOENT;
584 goto out;
585 }
586
587 if (feo->nodeid != nodeid) {
588 /*
589 * Something is very wrong with the server if "foo/." has a
590 * different inode number than "foo".
591 */
592 static const char exterr[] = "Inconsistent LOOKUP response: "
593 "\"FILE/.\" has a different inode number than \"FILE\".";
594 fuse_warn(data, FSESS_WARN_DOT_LOOKUP, exterr);
595 error = EXTERROR(EIO, exterr);
596 goto out;
597 }
598
599 vtyp = IFTOVT(feo->attr.mode);
600 error = fuse_vnode_get(mp, feo, nodeid, NULL, vpp, NULL, vtyp);
601 if (error)
602 goto out;
603 fvdat = VTOFUD(*vpp);
604
605 if (timespeccmp(&now, &fvdat->last_local_modify, >)) {
606 /*
607 * Attributes from the server are definitely newer than the
608 * last attributes we sent to the server, so cache them.
609 */
610 fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid,
611 feo->attr_valid_nsec, NULL, true);
612 }
613 fuse_validity_2_bintime(feo->entry_valid, feo->entry_valid_nsec,
614 &fvdat->entry_cache_timeout);
615 out:
616 fdisp_destroy(&fdi);
617 return error;
618 }
619
620 static int
fuse_vfsop_root(struct mount * mp,int lkflags,struct vnode ** vpp)621 fuse_vfsop_root(struct mount *mp, int lkflags, struct vnode **vpp)
622 {
623 struct fuse_data *data = fuse_get_mpdata(mp);
624 int err = 0;
625
626 if (data->vroot != NULL) {
627 err = vget(data->vroot, lkflags);
628 if (err == 0)
629 *vpp = data->vroot;
630 } else {
631 err = fuse_vnode_get(mp, NULL, FUSE_ROOT_ID, NULL, vpp, NULL,
632 VDIR);
633 if (err == 0) {
634 FUSE_LOCK();
635 MPASS(data->vroot == NULL || data->vroot == *vpp);
636 if (data->vroot == NULL) {
637 SDT_PROBE2(fusefs, , vfsops, trace, 1,
638 "new root vnode");
639 data->vroot = *vpp;
640 FUSE_UNLOCK();
641 vref(*vpp);
642 } else if (data->vroot != *vpp) {
643 SDT_PROBE2(fusefs, , vfsops, trace, 1,
644 "root vnode race");
645 FUSE_UNLOCK();
646 vput(*vpp);
647 vrecycle(*vpp);
648 *vpp = data->vroot;
649 } else
650 FUSE_UNLOCK();
651 }
652 }
653 return err;
654 }
655
656 static int
fuse_vfsop_statfs(struct mount * mp,struct statfs * sbp)657 fuse_vfsop_statfs(struct mount *mp, struct statfs *sbp)
658 {
659 struct fuse_dispatcher fdi;
660 int err = 0;
661
662 struct fuse_statfs_out *fsfo;
663 struct fuse_data *data;
664
665 data = fuse_get_mpdata(mp);
666
667 if (!(data->dataflags & FSESS_INITED))
668 goto fake;
669
670 fdisp_init(&fdi, 0);
671 fdisp_make(&fdi, FUSE_STATFS, mp, FUSE_ROOT_ID, NULL, NULL);
672 err = fdisp_wait_answ(&fdi);
673 if (err) {
674 fdisp_destroy(&fdi);
675 if (err == ENOTCONN) {
676 /*
677 * We want to seem a legitimate fs even if the daemon
678 * is stiff dead... (so that, eg., we can still do path
679 * based unmounting after the daemon dies).
680 */
681 goto fake;
682 }
683 return err;
684 }
685 fsfo = fdi.answ;
686
687 sbp->f_blocks = fsfo->st.blocks;
688 sbp->f_bfree = fsfo->st.bfree;
689 sbp->f_bavail = fsfo->st.bavail;
690 sbp->f_files = fsfo->st.files;
691 sbp->f_ffree = fsfo->st.ffree; /* cast from uint64_t to int64_t */
692 sbp->f_namemax = fsfo->st.namelen;
693 sbp->f_bsize = fsfo->st.frsize; /* cast from uint32_t to uint64_t */
694
695 fdisp_destroy(&fdi);
696 return 0;
697
698 fake:
699 sbp->f_blocks = 0;
700 sbp->f_bfree = 0;
701 sbp->f_bavail = 0;
702 sbp->f_files = 0;
703 sbp->f_ffree = 0;
704 sbp->f_namemax = 0;
705 sbp->f_bsize = S_BLKSIZE;
706
707 return 0;
708 }
709